The mouse probably must support the Microsoft mouse interface for transmitting data packets to the serial port. The Microsoft Booster mouse is a bus mouse, so it will not work. So to use a Compact Printer, you need a serial switchbox. and the appropriate pin converters (BERG to D-Shell for the system) (D-Shell to BERG for the printer). I suppose you could simply swap the mouse and printer connectors directly from the port, but this is obviously not advisable due to the stress placed on the pins.

Trixter wrote:Colorpaint was originally designed for use with mice that connected via sidecar. So it was of course possible to have mouse + compact printer connected at the same time.

I think the problem may be an conflict between the PCjr. BIOS and the ColorPaint program.

Surely you didn't mean to write this

Does ColorPaint work with a Microsoft Booster sidecar mouse? I

Yes, that sentence does seem nonsensical. I supposed it should be replaced with something like "I guess that ColorPaint, as put on the disk, is incompatible with a real PCjr. in a way DOSBox hasn't emulated yet."

DOSBox's emulation of the PCjr. has improved quite a bit in the SVN, Venetian Blinds work with games only supporting Tandy.

Not to drag my thread offtopic, but has anyone used MESS to emulate a PCjr?DOSBox emulation isn't accurate enough, and thus isn't going to help me debug why colorpaint won't load off floppy, but I just remembered that MESS might be able to help.